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class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-10-22T03:03:37.000Z" title="发表于 2020-10-22 11:03:37">2020-10-22</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-01-10T12:27:58.363Z" title="更新于 2021-01-10 20:27:58">2021-01-10</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF%E5%AD%A6%E4%B9%A0/">前端学习</a></span></div><div class="meta-secondline"> <span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">2.1k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>8分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="数据缓存"><a href="#数据缓存" class="headerlink" title="数据缓存:"></a>数据缓存:</h1><blockquote>
<p>纯属随笔记录，具体详细教程，请查阅<a target="_blank" rel="noopener" href="https://uniapp.dcloud.io/">uni-app官方文档</a></p>
</blockquote>
<ul>
<li><h4 id="uni-setStorage"><a href="#uni-setStorage" class="headerlink" title="uni.setStorage"></a><code>uni.setStorage</code></h4><ul>
<li><p>将数据存储在本地缓存中指定的 key 中，会覆盖掉原来该 key 对应的内容，这是一个<strong>异步接口</strong>。</p>
</li>
<li><h4 id="参数说明"><a href="#参数说明" class="headerlink" title="参数说明:"></a>参数说明:</h4><table>
<thead>
<tr>
<th align="center">参数名</th>
<th align="center">类型</th>
<th align="center">必填</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">key</td>
<td align="center">String</td>
<td align="center">是</td>
<td align="center">本地缓存中的指定的 key</td>
</tr>
<tr>
<td align="center">data</td>
<td align="center">Any</td>
<td align="center">是</td>
<td align="center">需要存储的内容，只支持原生类型、及能够通过 <code>JSON.stringify</code> 序列化的对象</td>
</tr>
<tr>
<td align="center">success</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用成功的回调函数</td>
</tr>
<tr>
<td align="center">fail</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用失败的回调函数</td>
</tr>
<tr>
<td align="center">complete</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用结束的回调函数(调用成功，失败都会执行)</td>
</tr>
</tbody></table>
</li>
<li><p><strong>代码演示:</strong></p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">    &lt;view&gt;</span><br><span class="line">        &lt;button type&#x3D;&quot;primary&quot; @click&#x3D;&quot;setStor&quot;&gt;存储数据&lt;&#x2F;button&gt;</span><br><span class="line">    &lt;&#x2F;view&gt;</span><br><span class="line">&lt;&#x2F;template&gt;</span><br><span class="line"></span><br><span class="line">&lt;script&gt;</span><br><span class="line">    export default &#123;</span><br><span class="line">        methods: &#123;</span><br><span class="line">            setStor () &#123;</span><br><span class="line">                uni.setStorage(&#123;</span><br><span class="line">                     key: &#39;id&#39;,</span><br><span class="line">                     data: 100,</span><br><span class="line">                     success () &#123;</span><br><span class="line">                         console.log(&#39;存储成功&#39;)</span><br><span class="line">                     &#125;</span><br><span class="line">                 &#125;)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&lt;&#x2F;script&gt;</span><br><span class="line"></span><br><span class="line">&lt;style&gt;</span><br><span class="line">&lt;&#x2F;style&gt;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<hr>
</li>
<li><h4 id="uni-setStorageSync"><a href="#uni-setStorageSync" class="headerlink" title="uni.setStorageSync"></a><code>uni.setStorageSync</code></h4><ul>
<li><p>将 data 存储在本地缓存中指定的 key 中，会覆盖掉原来该 key 对应的内容，这是一个<strong>同步接口</strong>。</p>
</li>
<li><p>相关参数简单，请看官方文档</p>
</li>
<li><p><strong>代码演示:</strong></p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">    &lt;view&gt;</span><br><span class="line">        &lt;button type&#x3D;&quot;primary&quot; @click&#x3D;&quot;setStor&quot;&gt;存储数据&lt;&#x2F;button&gt;</span><br><span class="line">    &lt;&#x2F;view&gt;</span><br><span class="line">&lt;&#x2F;template&gt;</span><br><span class="line"></span><br><span class="line">&lt;script&gt;</span><br><span class="line">    export default &#123;</span><br><span class="line">        methods: &#123;</span><br><span class="line">            setStor () &#123;</span><br><span class="line">                uni.setStorageSync(&#39;id&#39;,100)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&lt;&#x2F;script&gt;</span><br><span class="line"></span><br><span class="line">&lt;style&gt;</span><br><span class="line">&lt;&#x2F;style&gt;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<hr>
</li>
<li><h4 id="uni-getStorage"><a href="#uni-getStorage" class="headerlink" title="uni.getStorage:"></a><code>uni.getStorage:</code></h4><ul>
<li><p>从本地缓存中<strong>异步</strong>获取指定 key 对应的内容。</p>
<table>
<thead>
<tr>
<th align="center">参数名</th>
<th align="center">类型</th>
<th align="center">必填</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">key</td>
<td align="center">String</td>
<td align="center">是</td>
<td align="center">本地缓存中的指定的 key</td>
</tr>
<tr>
<td align="center">success</td>
<td align="center">Function</td>
<td align="center">是</td>
<td align="center">接口调用的回调函数，res = {data: key对应的内容}</td>
</tr>
<tr>
<td align="center">fail</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用失败的回调函数</td>
</tr>
<tr>
<td align="center">complete</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用结束的回调函数（调用成功、失败都会执行）</td>
</tr>
</tbody></table>
</li>
<li><p><strong>success 返回参数说明</strong></p>
<table>
<thead>
<tr>
<th align="center">参数</th>
<th align="center">类型</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">data</td>
<td align="center">Any</td>
<td align="center">key 对应的内容</td>
</tr>
</tbody></table>
</li>
<li><p><strong>代码演示</strong>：</p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">    &lt;view&gt;</span><br><span class="line">        &lt;button type&#x3D;&quot;primary&quot; @click&#x3D;&quot;getStorage&quot;&gt;获取数据&lt;&#x2F;button&gt;</span><br><span class="line">    &lt;&#x2F;view&gt;</span><br><span class="line">&lt;&#x2F;template&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line">    export default &#123;</span><br><span class="line">        data () &#123;</span><br><span class="line">            return &#123;</span><br><span class="line">                id: &#39;&#39;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        methods: &#123;</span><br><span class="line">            getStorage () &#123;</span><br><span class="line">                uni.getStorage(&#123;</span><br><span class="line">                    key: &#39;id&#39;,</span><br><span class="line">                    success:  res&#x3D;&gt;&#123;</span><br><span class="line">                        this.id &#x3D; res.data</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&lt;&#x2F;script&gt;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<hr>
</li>
<li><h4 id="uni-getStorageSync"><a href="#uni-getStorageSync" class="headerlink" title="uni.getStorageSync:"></a><code>uni.getStorageSync:</code></h4><ul>
<li><p>从本地缓存中<strong>同步</strong>获取指定 key 对应的内容。</p>
</li>
<li><p><strong>代码演示</strong></p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">    &lt;view&gt;</span><br><span class="line">        &lt;button type&#x3D;&quot;primary&quot; @click&#x3D;&quot;getStorage&quot;&gt;获取数据&lt;&#x2F;button&gt;</span><br><span class="line">    &lt;&#x2F;view&gt;</span><br><span class="line">&lt;&#x2F;template&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line">    export default &#123;</span><br><span class="line">        methods: &#123;</span><br><span class="line">            getStorage () &#123;</span><br><span class="line">                const id &#x3D; uni.getStorageSync(&#39;id&#39;)</span><br><span class="line">                console.log(id)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&lt;&#x2F;script&gt;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<hr>
</li>
<li><h4 id="uni-removeStorage"><a href="#uni-removeStorage" class="headerlink" title="uni.removeStorage:"></a><code>uni.removeStorage:</code></h4><ul>
<li><p>从本地缓存中<strong>异步</strong>移除指定 key。</p>
<table>
<thead>
<tr>
<th align="center">参数名</th>
<th align="center">类型</th>
<th align="center">必填</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">key</td>
<td align="center">String</td>
<td align="center">是</td>
<td align="center">本地缓存中的指定的 key</td>
</tr>
<tr>
<td align="center">success</td>
<td align="center">Function</td>
<td align="center">是</td>
<td align="center">接口调用的回调函数</td>
</tr>
<tr>
<td align="center">fail</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用失败的回掉函数</td>
</tr>
<tr>
<td align="center">complete</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用结束的回调函数（调用成功，失败都会执行）</td>
</tr>
</tbody></table>
</li>
<li><p><strong>代码演示</strong></p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">    &lt;view&gt;</span><br><span class="line">        &lt;button type&#x3D;&quot;primary&quot; @click&#x3D;&quot;removeStorage&quot;&gt;删除数据&lt;&#x2F;button&gt;</span><br><span class="line">    &lt;&#x2F;view&gt;</span><br><span class="line">&lt;&#x2F;template&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line">    export default &#123;</span><br><span class="line">        methods: &#123;</span><br><span class="line">            removeStorage () &#123;</span><br><span class="line">                uni.removeStorage(&#123;</span><br><span class="line">                    key: &#39;id&#39;,</span><br><span class="line">                    success: function () &#123;</span><br><span class="line">                        console.log(&#39;删除成功&#39;)</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&lt;&#x2F;script&gt;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<hr>
</li>
<li><h4 id="uni-removeStorageSync"><a href="#uni-removeStorageSync" class="headerlink" title="uni.removeStorageSync:"></a><code>uni.removeStorageSync:</code></h4><ul>
<li><p>从本地缓存中<strong>同步</strong>移除指定 key。</p>
</li>
<li><p><strong>代码演示</strong></p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">    &lt;view&gt;</span><br><span class="line">        &lt;button type&#x3D;&quot;primary&quot; @click&#x3D;&quot;removeStorage&quot;&gt;删除数据&lt;&#x2F;button&gt;</span><br><span class="line">    &lt;&#x2F;view&gt;</span><br><span class="line">&lt;&#x2F;template&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line">    export default &#123;</span><br><span class="line">        methods: &#123;</span><br><span class="line">            removeStorage () &#123;</span><br><span class="line">                uni.removeStorageSync(&#39;id&#39;)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&lt;&#x2F;script&gt;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<hr>
</li>
<li><h4 id="其他的方法请看官会文档！"><a href="#其他的方法请看官会文档！" class="headerlink" title="其他的方法请看官会文档！"></a>其他的方法请看官会文档！</h4></li>
</ul>
<hr>
<ul>
<li><h2 id="上传图片、预览图片"><a href="#上传图片、预览图片" class="headerlink" title="上传图片、预览图片:"></a>上传图片、预览图片:</h2><ul>
<li><h4 id="上传图片-uni-chooseImage"><a href="#上传图片-uni-chooseImage" class="headerlink" title="上传图片: uni.chooseImage()"></a>上传图片: <code>uni.chooseImage()</code></h4><ul>
<li><p>从本地相册选择图片或使用相机拍照。</p>
</li>
<li><p>App端如需要更丰富的相机拍照API（如直接调用前置摄像头），参考<a target="_blank" rel="noopener" href="https://www.html5plus.org/doc/zh_cn/camera.html">plus.camera</a></p>
<table>
<thead>
<tr>
<th align="center">参数名</th>
<th align="center">类型</th>
<th align="center">必填</th>
<th align="center">说明</th>
<th align="center">平台差异说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">count</td>
<td align="center">Number</td>
<td align="center">否</td>
<td align="center">最多可以选择的图片张数，默认为9</td>
<td align="center">见下方说明</td>
</tr>
<tr>
<td align="center">sizeType</td>
<td align="center">Array<String></td>
<td align="center">否</td>
<td align="center">original 原图，compressed 压缩图，默认二者都有</td>
<td align="center">App、微信小程序、支付宝小程序、百度小程序</td>
</tr>
<tr>
<td align="center">sourceType</td>
<td align="center">Array<String></td>
<td align="center">否</td>
<td align="center">album 从相册选图，camera 使用相机，默认二者都有。</td>
<td align="center"></td>
</tr>
<tr>
<td align="center">success</td>
<td align="center">Function</td>
<td align="center">是</td>
<td align="center">成功则返回图片的本地文件路径列表 tempFilePaths</td>
<td align="center"></td>
</tr>
<tr>
<td align="center">fail</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用失败的回调函数</td>
<td align="center">小程序，App</td>
</tr>
<tr>
<td align="center">complete</td>
<td align="center">Function</td>
<td align="center">否</td>
<td align="center">接口调用结束的回调函数（调用成功，失败都会执行）</td>
<td align="center"></td>
</tr>
</tbody></table>
</li>
</ul>
<h4 id="注意："><a href="#注意：" class="headerlink" title="注意："></a>注意：</h4><ul>
<li><code>count</code> 值在 H5 平台的表现，基于浏览器本身的规范。目前测试的结果来看，只能限制<strong>单选/多选</strong>，并不能限制数量。并且，在实际的手机浏览器很少有能够支持多选的。</li>
<li><code>sourceType</code> 在H5端对应<code>input</code>的<code>capture</code>属性，设置为<code>[&#39;album&#39;]</code>无效，依然可以使用相机。</li>
<li>可以通过用户授权API来判断用户是否给应用授予相册或摄像头的访问权限<a target="_blank" rel="noopener" href="https://uniapp.dcloud.io/api/other/authorize">https://uniapp.dcloud.io/api/other/authorize</a></li>
<li>App端如需选择非媒体文件，可在插件市场搜索<a target="_blank" rel="noopener" href="https://ext.dcloud.net.cn/search?q=%E6%96%87%E4%BB%B6%E9%80%89%E6%8B%A9">文件选择</a>，其中Android端可以使用Native.js，无需原生插件，而iOS端需要原生插件。</li>
</ul>
<h4 id="案例代码"><a href="#案例代码" class="headerlink" title="案例代码:"></a>案例代码:</h4><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;template&gt;</span><br><span class="line">    &lt;view&gt;</span><br><span class="line">        &lt;button @click&#x3D;&quot;chooseImg&quot; type&#x3D;&quot;primary&quot;&gt;上传图片&lt;&#x2F;button&gt;</span><br><span class="line">        &lt;view&gt;</span><br><span class="line">            &lt;image v-for&#x3D;&quot;item in imgArr&quot; :src&#x3D;&quot;item&quot; :key&#x3D;&quot;index&quot;&gt;&lt;&#x2F;image&gt;</span><br><span class="line">        &lt;&#x2F;view&gt;</span><br><span class="line">    &lt;&#x2F;view&gt;</span><br><span class="line">&lt;&#x2F;template&gt;</span><br><span class="line"></span><br><span class="line">&lt;script&gt;</span><br><span class="line">    export default &#123;</span><br><span class="line">        data () &#123;</span><br><span class="line">            return &#123;</span><br><span class="line">                imgArr: []</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        methods: &#123;</span><br><span class="line">            chooseImg () &#123;</span><br><span class="line">                uni.chooseImage(&#123;</span><br><span class="line">                    count: 9,</span><br><span class="line">                    success: res&#x3D;&gt;&#123;</span><br><span class="line">                        this.imgArr &#x3D; res.tempFilePaths</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&lt;&#x2F;script&gt;</span><br></pre></td></tr></table></figure>

<hr>
</li>
<li><h4 id="预览图片-uni-previewImage"><a href="#预览图片-uni-previewImage" class="headerlink" title="预览图片: uni.previewImage:"></a>预览图片: <code>uni.previewImage</code>:</h4><h4 id="必填参数："><a href="#必填参数：" class="headerlink" title="必填参数："></a>必填参数：</h4><table>
<thead>
<tr>
<th align="center">参数名</th>
<th align="center">类型</th>
<th align="center">必填</th>
<th align="center">说明</th>
</tr>
</thead>
<tbody><tr>
<td align="center">current</td>
<td align="center">String/Number</td>
<td align="center">详见下方说明</td>
<td align="center">详见下方说明</td>
</tr>
<tr>
<td align="center">urls</td>
<td align="center">Array<String></td>
<td align="center">是</td>
<td align="center">需要预览的图片链接列表</td>
</tr>
</tbody></table>
<h4 id="注意"><a href="#注意" class="headerlink" title="注意:"></a>注意:</h4><ul>
<li><p><strong>current 参数说明</strong>:</p>
<blockquote>
<p><code>current</code> 为当前显示图片的链接/索引值，不填或填写的值无效则为 urls 的第一张。<strong>App平台在 1.9.5至1.9.8之间，current为必填。不填会报错</strong></p>
<p>注意，当 <code>urls</code> 中有重复的图片链接时：</p>
<ul>
<li>传链接，预览结果始终显示该链接在 <code>urls</code> 中第一次出现的位置。</li>
<li>传索引值，在微信/百度/字节跳动小程序平台，会过滤掉传入的 <code>urls</code> 中该索引值之前与其对应图片链接重复的值。其它平台会保留原始的 <code>urls</code> 不会做去重处理。</li>
</ul>
<p>举例说明：</p>
<p>一组图片 <code>[A, B1, C, B2, D]</code>，其中 B1 与 B2 的图片链接是一样的。</p>
<ul>
<li>传 B2 的链接，预览的结果是 B1，前一张是 A，下一张是 C。</li>
<li>传 B2 的索引值 3，预览的结果是 B2，前一张是 C，下一张是 D。此时在微信/百度/字节跳动小程序平台，最终传入的 <code>urls</code> 是 <code>[A, C, B2, D]</code>，过滤掉了与 B2 重复的 B1。</li>
</ul>
</blockquote>
</li>
</ul>
</li>
</ul>
<hr>
</li>
<li><h2 id="条件注释实现跨段兼容："><a href="#条件注释实现跨段兼容：" class="headerlink" title="条件注释实现跨段兼容："></a>条件注释实现跨段兼容：</h2><ul>
<li>条件编译是用<strong>特殊的注释</strong>作为标记，在编译时根据这些特殊的注释，<strong>将注释里面的代码编译到不同平台。</strong></li>
</ul>
<h4 id="语法："><a href="#语法：" class="headerlink" title="语法："></a>语法：</h4><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;!-- #ifdef H5 --&gt;</span><br><span class="line">        &lt;text&gt;我是页面才显示&lt;&#x2F;text&gt;</span><br><span class="line">&lt;!-- #endif --&gt;</span><br><span class="line">&lt;!-- #ifdef MP-WEIXIN --&gt;</span><br><span class="line">        &lt;text&gt;我是微信小程序才显示&lt;&#x2F;text&gt;</span><br><span class="line">&lt;!-- #endif --&gt;</span><br><span class="line"></span><br><span class="line">&#x2F;&#x2F;以 #ifdef + 平台标识 开头，以 #endif 结尾。</span><br></pre></td></tr></table></figure>

<h4 id="平台标识"><a href="#平台标识" class="headerlink" title="平台标识:"></a>平台标识:</h4><table>
<thead>
<tr>
<th>值</th>
<th>平台</th>
<th>参考文档</th>
</tr>
</thead>
<tbody><tr>
<td>APP-PLUS</td>
<td>5+App</td>
<td><a target="_blank" rel="noopener" href="http://www.html5plus.org/doc/">HTML5+ 规范</a></td>
</tr>
<tr>
<td>H5</td>
<td>H5</td>
<td></td>
</tr>
<tr>
<td>MP-WEIXIN</td>
<td>微信小程序</td>
<td><a target="_blank" rel="noopener" href="https://developers.weixin.qq.com/miniprogram/dev/api/">微信小程序</a></td>
</tr>
<tr>
<td>MP-ALIPAY</td>
<td>支付宝小程序</td>
<td><a target="_blank" rel="noopener" href="https://docs.alipay.com/mini/developer/getting-started">支付宝小程序</a></td>
</tr>
<tr>
<td>MP-BAIDU</td>
<td>百度小程序</td>
<td><a target="_blank" rel="noopener" href="https://smartprogram.baidu.com/docs/develop/tutorial/codedir/">百度小程序</a></td>
</tr>
<tr>
<td>MP-TOUTIAO</td>
<td>头条小程序</td>
<td><a target="_blank" rel="noopener" href="https://developer.toutiao.com/dev/cn/mini-app/develop/framework/basic-reference/introduction">头条小程序</a></td>
</tr>
<tr>
<td>MP-QQ</td>
<td>QQ小程序</td>
<td>（目前仅cli版支持）</td>
</tr>
<tr>
<td>MP</td>
<td>微信小程序/支付宝小程序/百度小程序/头条小程序/QQ小程序</td>
<td></td>
</tr>
</tbody></table>
<ul>
<li><h4 id="组件的条件注释"><a href="#组件的条件注释" class="headerlink" title="组件的条件注释:"></a>组件的条件注释:</h4><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">&lt;!-- #ifdef H5 --&gt;</span><br><span class="line">&lt;view&gt;</span><br><span class="line">  h5页面会显示</span><br><span class="line">&lt;&#x2F;view&gt;</span><br><span class="line">&lt;!-- #endif --&gt;</span><br><span class="line">&lt;!-- #ifdef MP-WEIXIN --&gt;</span><br><span class="line">&lt;view&gt;</span><br><span class="line">  微信小程序会显示</span><br><span class="line">&lt;&#x2F;view&gt;</span><br><span class="line">&lt;!-- #endif --&gt;</span><br><span class="line">&lt;!-- #ifdef APP-PLUS --&gt;</span><br><span class="line">&lt;view&gt;</span><br><span class="line">  app会显示</span><br><span class="line">&lt;&#x2F;view&gt;</span><br><span class="line">&lt;!-- #endif --&gt;</span><br></pre></td></tr></table></figure>
</li>
<li><h4 id="api的条件注释："><a href="#api的条件注释：" class="headerlink" title="api的条件注释："></a><code>api</code>的条件注释：</h4><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">onLoad () &#123;</span><br><span class="line">  <span class="comment">//#ifdef MP-WEIXIN</span></span><br><span class="line">  <span class="built_in">console</span>.log(<span class="string">&#x27;微信小程序&#x27;</span>)</span><br><span class="line">  <span class="comment">//#endif</span></span><br><span class="line">  <span class="comment">//#ifdef H5</span></span><br><span class="line">  <span class="built_in">console</span>.log(<span class="string">&#x27;h5页面&#x27;</span>)</span><br><span class="line">  <span class="comment">//#endif</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><h4 id="样式的条件注释"><a href="#样式的条件注释" class="headerlink" title="样式的条件注释:"></a>样式的条件注释:</h4><figure class="highlight css"><table><tr><td class="code"><pre><span class="line"><span class="comment">/* #ifdef H5 */</span></span><br><span class="line"><span class="selector-tag">view</span>&#123;</span><br><span class="line">  <span class="attribute">background</span>: red;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/* #endif */</span></span><br><span class="line"><span class="comment">/* #ifdef MP-WEIXIN */</span></span><br><span class="line"><span class="selector-tag">view</span>&#123;</span><br><span class="line">  <span class="attribute">background</span>: green;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/* #endif */</span></span><br></pre></td></tr></table></figure>

</li>
</ul>
</li>
</ul>
<hr>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">六根清静</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://liugenqingjing2.coding.me/2020/10/22/uni-app%E5%BC%80%E5%8F%91-%E5%85%AD-%E6%95%B0%E6%8D%AE%E7%BC%93%E5%AD%98%E5%92%8C%E5%9B%BE%E7%89%87%E4%B8%8A%E4%BC%A0%E9%A2%84%E8%A7%88%E4%BB%A5%E5%8F%8A%E6%B3%A8%E9%87%8A%E5%85%BC%E5%AE%B9/">https://liugenqingjing2.coding.me/2020/10/22/uni-app开发-六-数据缓存和图片上传预览以及注释兼容/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://liugenqingjing2.coding.me" target="_blank">小何blog 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href="#%E5%8F%82%E6%95%B0%E8%AF%B4%E6%98%8E"><span class="toc-number">1.0.0.2.</span> <span class="toc-text">参数说明:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#uni-setStorageSync"><span class="toc-number">1.0.0.3.</span> <span class="toc-text">uni.setStorageSync</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#uni-getStorage"><span class="toc-number">1.0.0.4.</span> <span class="toc-text">uni.getStorage:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#uni-getStorageSync"><span class="toc-number">1.0.0.5.</span> <span class="toc-text">uni.getStorageSync:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#uni-removeStorage"><span class="toc-number">1.0.0.6.</span> <span class="toc-text">uni.removeStorage:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#uni-removeStorageSync"><span class="toc-number">1.0.0.7.</span> <span class="toc-text">uni.removeStorageSync:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%85%B6%E4%BB%96%E7%9A%84%E6%96%B9%E6%B3%95%E8%AF%B7%E7%9C%8B%E5%AE%98%E4%BC%9A%E6%96%87%E6%A1%A3%EF%BC%81"><span class="toc-number">1.0.0.8.</span> <span class="toc-text">其他的方法请看官会文档！</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%8A%E4%BC%A0%E5%9B%BE%E7%89%87%E3%80%81%E9%A2%84%E8%A7%88%E5%9B%BE%E7%89%87"><span class="toc-number">1.1.</span> <span class="toc-text">上传图片、预览图片:</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%B8%8A%E4%BC%A0%E5%9B%BE%E7%89%87-uni-chooseImage"><span class="toc-number">1.1.0.1.</span> <span class="toc-text">上传图片: uni.chooseImage()</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%EF%BC%9A"><span class="toc-number">1.1.0.2.</span> <span class="toc-text">注意：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%A1%88%E4%BE%8B%E4%BB%A3%E7%A0%81"><span class="toc-number">1.1.0.3.</span> <span class="toc-text">案例代码:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%A2%84%E8%A7%88%E5%9B%BE%E7%89%87-uni-previewImage"><span class="toc-number">1.1.0.4.</span> <span class="toc-text">预览图片: uni.previewImage:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%BF%85%E5%A1%AB%E5%8F%82%E6%95%B0%EF%BC%9A"><span class="toc-number">1.1.0.5.</span> <span class="toc-text">必填参数：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F"><span class="toc-number">1.1.0.6.</span> <span class="toc-text">注意:</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%9D%A1%E4%BB%B6%E6%B3%A8%E9%87%8A%E5%AE%9E%E7%8E%B0%E8%B7%A8%E6%AE%B5%E5%85%BC%E5%AE%B9%EF%BC%9A"><span class="toc-number">1.2.</span> <span class="toc-text">条件注释实现跨段兼容：</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%AD%E6%B3%95%EF%BC%9A"><span class="toc-number">1.2.0.1.</span> <span class="toc-text">语法：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%B9%B3%E5%8F%B0%E6%A0%87%E8%AF%86"><span class="toc-number">1.2.0.2.</span> <span class="toc-text">平台标识:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E7%BB%84%E4%BB%B6%E7%9A%84%E6%9D%A1%E4%BB%B6%E6%B3%A8%E9%87%8A"><span class="toc-number">1.2.0.3.</span> <span class="toc-text">组件的条件注释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#api%E7%9A%84%E6%9D%A1%E4%BB%B6%E6%B3%A8%E9%87%8A%EF%BC%9A"><span class="toc-number">1.2.0.4.</span> <span class="toc-text">api的条件注释：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%A0%B7%E5%BC%8F%E7%9A%84%E6%9D%A1%E4%BB%B6%E6%B3%A8%E9%87%8A"><span class="toc-number">1.2.0.5.</span> <span class="toc-text">样式的条件注释:</span></a></li></ol></li></ol></li></ol></li></ol></div></div></div><div class="card-widget card-recent-post"><div class="card-content"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2021/03/21/Node-js%E5%AD%A6%E4%B9%A0-%E4%BA%8C%E5%8D%81%E4%B8%89-%E8%B7%A8%E5%9F%9F%E4%BB%8B%E7%BB%8D%E5%92%8CJSONP%E4%BB%8B%E7%BB%8D/" title="Node.js学习(二十三.跨域介绍和JSONP介绍)"><img data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210321/qWPEashJOuNK.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Node.js学习(二十三.跨域介绍和JSONP介绍)"/></a><div class="content"><a class="title" href="/2021/03/21/Node-js%E5%AD%A6%E4%B9%A0-%E4%BA%8C%E5%8D%81%E4%B8%89-%E8%B7%A8%E5%9F%9F%E4%BB%8B%E7%BB%8D%E5%92%8CJSONP%E4%BB%8B%E7%BB%8D/" title="Node.js学习(二十三.跨域介绍和JSONP介绍)">Node.js学习(二十三.跨域介绍和JSONP介绍)</a><time 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